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Erosion and Deposition6th Grade Science

I. Changing Surface

A. Movement1. Sediment = Material moved by erosion

2. Deposition = Build-up of sediment

B. Gravity (Mass)1. Landslides

2. Mudflow

3. Slump

4. Creep

II. Water

A. Runoff Amounts1. Rain amount

2. Vegetation

3. Soil Type

4. Shape of land

5. Human use

B. Types

1. Rills – Tiny grooves

2. Gully – Large groove

3. Stream – Gullies combine

4. River – Streams combine

5. Tributaries – Into major river

C. Erosion

1. Waterfall

2. Flood Plains

3. Meanders – Curved flow in flat plain

4. Oxbow lake – Cut off from river

D. Deposit

1. Alluvial Fan

2. Delta

3. Flood Plain

E. Ground

1. Caves

i. Stalactite

ii. Stalagmite

2. Karst

III. Moving Water

A. Erosion

1. Abrasion – Wearing away rock with sediment

2. Load – Amount of sediment in river

B. Load

1. Slope – Faster means more load

2. Volume – More water means more load

3. Shape – Deep stream is faster

i. Turbulence – Multidirectional movement

C. Factors

1. Slower side leaves deposits

2. Faster side causes erosion

IV. Glaciers

A. Types

1. Continental

i. 10% of Land

2. Valley Glaciers

i. High mountain snow fall

ii. Motion cm to meters per day.

B. Shaping Land

1. Plucking

2. V-shape river to U shape valley

3. Deposits

i. Till

ii. Moraine – Edge of glacier

iii. Kettle – Depression in surface

V. Waves

A. Erosion

1. Hitting shoreline

2. Abrasion

3. Worst at headlands

B. Deposition

1. Beach – Wave washed sediment

2. Longshore drift – Movement with current

3. Spit – Fingerlike projection of sand

4. Sandbars – Broken up spits

VI. Wind

A. Erosion1. Deflation

2. Abrasion

B. Deposition

1. Sand Dunes

2. Loess Deposits

QUIZ